Hello Walter,
Walter, DL1KSW 24.02.02
Hello,
I am new in this list, at first some short infos oubt me:
I am 50 years "young" and my license ist 10 jears "old".
I am member of AGCW-DL and member of DL-QRP-AG.
Now I want to be in future qrv on the lf band 136khz.
I want to be qrv in slow cw with PC/soundcard and qrv with "fingers-cw".
My Icom IC 706 MKII not so good for receive 136khz, I want a homemade TRX.
Now my questions:
Can anyone send me tips for a TRX or RX and TX for this band with 5 watt
Output?
I want, that the RX and TX are to communicate with the soundcard of PC,
for
example with optokoppler integrate in RX and TX. RX/TX also communicate
with my
fingers CW, with a Elbug.
... welcome to the fascinating world of LF! There are some easy and
simple-to-build transmitters on the web, to begin with I would suggest to
build the DF3LP tranmitter
(http://www.qsl.net/df3lp/137khz/LF-transmitter.html) that produces about
50 Watt but surely can be run with less. OM2TW has designed a simple 5 Watt
PA for LF using a TDA 2030
(http://www.qsl.net/om2tw/index_files/obsah_files/tx_136.pdf) that I use
successfully as a buffer for my PA.
Just one word of warning: you may expect your antenna to produce a "gain"
of minus 30 to minus 40 dB (!) compared to a dipole, so whatever power you
run, you will allways run QRP! Using real 5 Watts PA output will be a
challenge! With my 350 Watt PA (and a special permit from the RegTP) I
produce approx. 250 mW ERP!
You find lonks to most of the active LF amateurs who run a website on
http://www.qru.de/links.html
Best 73 and see you on LF!
Geri, DK8KW (W1KW)
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